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/*******************************************************************************
* Copyright (c) 2007, 2010 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.model.listener.awt;
import java.awt.EventQueue;
import org.eclipse.jpt.common.utility.model.event.CollectionAddEvent;
import org.eclipse.jpt.common.utility.model.event.CollectionChangeEvent;
import org.eclipse.jpt.common.utility.model.event.CollectionClearEvent;
import org.eclipse.jpt.common.utility.model.event.CollectionRemoveEvent;
import org.eclipse.jpt.common.utility.model.listener.CollectionChangeListener;
/**
* Wrap another collection change listener and forward events to it on the AWT
* event queue, asynchronously if necessary. If the event arrived on the UI
* thread that is probably because it was initiated by a UI widget; as a
* result, we want to loop back synchronously so the events can be
* short-circuited.
*/
public final class AWTCollectionChangeListenerWrapper
implements CollectionChangeListener
{
private final CollectionChangeListener listener;
public AWTCollectionChangeListenerWrapper(CollectionChangeListener listener) {
super();
if (listener == null) {
throw new NullPointerException();
}
this.listener = listener;
}
public void itemsAdded(CollectionAddEvent event) {
if (this.isExecutingOnUIThread()) {
this.itemsAdded_(event);
} else {
this.executeOnEventQueue(this.buildItemsAddedRunnable(event));
}
}
public void itemsRemoved(CollectionRemoveEvent event) {
if (this.isExecutingOnUIThread()) {
this.itemsRemoved_(event);
} else {
this.executeOnEventQueue(this.buildItemsRemovedRunnable(event));
}
}
public void collectionCleared(CollectionClearEvent event) {
if (this.isExecutingOnUIThread()) {
this.collectionCleared_(event);
} else {
this.executeOnEventQueue(this.buildCollectionClearedRunnable(event));
}
}
public void collectionChanged(CollectionChangeEvent event) {
if (this.isExecutingOnUIThread()) {
this.collectionChanged_(event);
} else {
this.executeOnEventQueue(this.buildCollectionChangedRunnable(event));
}
}
private Runnable buildItemsAddedRunnable(final CollectionAddEvent event) {
return new Runnable() {
public void run() {
AWTCollectionChangeListenerWrapper.this.itemsAdded_(event);
}
@Override
public String toString() {
return "items added runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildItemsRemovedRunnable(final CollectionRemoveEvent event) {
return new Runnable() {
public void run() {
AWTCollectionChangeListenerWrapper.this.itemsRemoved_(event);
}
@Override
public String toString() {
return "items removed runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildCollectionClearedRunnable(final CollectionClearEvent event) {
return new Runnable() {
public void run() {
AWTCollectionChangeListenerWrapper.this.collectionCleared_(event);
}
@Override
public String toString() {
return "collection cleared runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildCollectionChangedRunnable(final CollectionChangeEvent event) {
return new Runnable() {
public void run() {
AWTCollectionChangeListenerWrapper.this.collectionChanged_(event);
}
@Override
public String toString() {
return "collection changed runnable"; //$NON-NLS-1$
}
};
}
private boolean isExecutingOnUIThread() {
return EventQueue.isDispatchThread();
}
/**
* {@link EventQueue#invokeLater(Runnable)} seems to work OK;
* but using {@link EventQueue#invokeAndWait(Runnable)} can sometimes make
* things more predictable when debugging, at the risk of deadlocks.
*/
private void executeOnEventQueue(Runnable r) {
EventQueue.invokeLater(r);
// try {
// EventQueue.invokeAndWait(r);
// } catch (InterruptedException ex) {
// throw new RuntimeException(ex);
// } catch (java.lang.reflect.InvocationTargetException ex) {
// throw new RuntimeException(ex);
// }
}
void itemsAdded_(CollectionAddEvent event) {
this.listener.itemsAdded(event);
}
void itemsRemoved_(CollectionRemoveEvent event) {
this.listener.itemsRemoved(event);
}
void collectionCleared_(CollectionClearEvent event) {
this.listener.collectionCleared(event);
}
void collectionChanged_(CollectionChangeEvent event) {
this.listener.collectionChanged(event);
}
@Override
public String toString() {
return "AWT(" + this.listener.toString() + ')'; //$NON-NLS-1$
}
}
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